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a in (-oo:+oo)
5*a+9 = 7*a-13 // - 7*a-13
5*a-(7*a)+9+13 = 0
5*a-7*a+9+13 = 0
22-2*a = 0 // - 22
-2*a = -22 // : -2
a = -22/(-2)
a = 11
a = 11
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